minor #14723 Remove merge conflict header (GawainLynch)

This PR was submitted for the 5.x branch but it was merged into the 5.2 branch instead.

Discussion
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Remove merge conflict header

Spotted this on the Sphinx fail from my last PR

Commits
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63a4e50 Remove merge conflict header

Author: wouterj

notifier.rst

@@ -139,7 +139,6 @@ integration with these chat services:
 
 ==========  ================================  ===========================================================================
 Service     Package                           DSN
-<<<<<<< HEAD
 ==========  ================================  ===========================================================================
 Discord     ``symfony/discord-notifier``      ``discord://TOKEN@default?webhook_id=ID``
 GoogleChat  ``symfony/google-chat-notifier``  ``googlechat://ACCESS_KEY:ACCESS_TOKEN@default/SPACE?threadKey=THREAD_KEY``